Valve



March 21, 1999.

c. Al RUDOLPH ET AL VALVE Filed Dec. 24, .19:54`

2 Sheets-Sheet l 75 LOW T IM @Wozu zdolpj MC Cafe/ 760 March 21, 1939.A C1 Al RUDOLPH ET ,M 1 2,151,050

. VALVE Filed Dec. 24, 1954 2 Sheets-Sheet 2 Ibi/mfom moored Mor. 21, 1939' l 2,151,050

u1-uT1azD sTATEs PATENT oFl-lcE VALVE Chester A. Rudolph and Edwin C. McCutcheon, Minneapolis, Minn., assixnors to Minneapolis- Honeywell Regulator Company, Minneapolis, Minn., a corporation o! Delaware Ap'puoouon nooember 24, 1934, sei-loi No. 158,969 16 claims. (ci. 23e- 42) This invention relates to valves and more paradjacent the lower extremity of the port opening ticularly to those types of valves that are capable -Il is another annular seat I8.

of automatic and manual operation. The bottom portion oi the casing IB is pro- An object of this invention is to provide a valve vided with an opening in communication with the 5 of the character described wherein asingle means' inlet chamber I2 and in this opening is screw- 5 is provided for regulating the automatic operathreaded a pipe I1 providing a means for supplytion of the valve and to move the valve to open ing iiuid to the valve.- The pipe I1 is preferably and closed positions. provided with a screen I8 to prevent foreign mat- Another object is to provide a novel valve structer from getting into the valve and impeding the ture cooperable with associated valve seats whereoperation thereof. v The casing Il) is laterally prol0 in a condition responsive devicemoves the valve vided with an opening which is in communication structure in one direction to engage Vone of the with the. outlet chamber I3 and a pipe i9 91'0- seats and wherein the valve structure is manuvided with a flange 2U iS adapted to engage' in ally moved in an opposite direction to engage the this opening to provide means for conveying uid other seat. out of the valve. A flanged coupling 2| which 15 I.a further object 1s to provide a vo1ve struotme engages the flange 20 of the pipe I9 is screwcooperable with associated valve seats wherein threaded 0n t0 the Casing i0 to form a uid-'Gight the valve structure is moved towards one or the seal between the pipe I9 and the casing lil. seats by a condition responsive device against the A hanged member 25 having a longiilidinaI in manual means are provided for adjusting the huid-tight relationship with a collar member 21 biasing means and for moving the valve towards by means 0f 9 But 25 being Screw-threaded on the other seat. t o the iianged member 25. The collar member 21 A still further object is to provide a novel coniS in tum Screw-threaded inO the 10WI portion 25 trol device for adjusting a biasing m a', y 1 of the casing i@ and aiiuid-tight joint is afforded 25 and for moving a valve. 'in this connection by means oi the annular seat Another object is to provide e balancing means 28 inte with the casina i@ engaging the collar for a valve of the character described wherein membi the euect oi both the inlet and outlet now to Fie. l., a tube 2@ 'is pressed 30 acting on the valve are completely balanced. and Solrel int@ the llgemember 25 and the 30 other obje-,em and advantages bosom@ op.. lower portion oi the tube is olosed in a uuid-tight parent to those smiled in the art upon refermce ann@ by m- Of Caio 3@ soldered in the to the accompanying specificationD ci and tubo m. Torcing tube 3BE is rigidi? secured drawings in which; within thetube i@ and a home member 82 having action of an adjustable biasing means and wherepassage therethrough is secured in and held in 20 Fig. i is4 a vertical sectional view oi e valve lo HM? e' o therein is in turn rigidly 35 im" in reinforcing tube iii. The tube 29 Fig. 2 is a vertical sectional tot V is adapted to receive a charge of volatile uid in of Fig. ibut showing' the parts in a arent i rv er to be pointed out hereinafter.'

tion and also ehog a moed -iorm oi the -:*r';:= nov.' to 2, a diuerent type of of our invention;

40 temperature responsive device temperature responsive device is shown and com- 40 Fig. 3 is a horizontal sectional view toison aubprises a plugs@ 'which is rigidly secured in a iiuidstantially ou the line ot Fig., 2; tight manner in the anged member 26. The

Fig. o is a horizontal sonal view taken subplug tl has an opening ther for receiving the stantially'on the line 1li-Noi Fig. 2; end of a capillary tube et, other end of the Fig. o io a plan view ,oiga portion oi the valve 'capillary tube to w* w to a volatile uid 45 of this invention. bulb @t in a moer which is old in the art. The valve comprises aoaainu io hat atr- A protective tubing ti surroung' the capillary verse partition ii therein which divides the inner tube @t io also rigidly secured in the plug memportion oi theca'ng it@ into a'lower et 'fof/zo ber to. The bulb @o is adapted to receive. a ber i2 and an upper outlet chamber it. The charge oi volatile uid in a manner tobe pointed 50 transverse partition ii is provided with a port out heroinair. opening ifi to estab communication between Secured to the upper end oi the anged memthe inlet chamberii and the outlet chamber It. ber 25 in coaxial alignment with the tube 29 of Located adjacent the upper extremity oi the port Fig. l or the plug 3B of Fig. 2 is a guide member opening I is an annular seat 'it a d located 40, having an opening therethrough and radially 55 extending notches 49 therein. Also secured in a fluid-tight manner to the upper portion of the iianged member 25 is one end of a bellows 4I. The other end of the bellows 4I is secured in a iiuid-tight manner to a movable enclosure member 42. The movable enclosure member 42 has a downwardly extending boss 49 with horizontal passages 44 located therein. An abutment screw 45 having an enlarged head is screw-threaded into the lower portion of the boss 43. A spring 46 surrounds the guide 40 and is adapted at certain times to engage the boss 43 of the movable enclosure member 42. The movable enclosure member 42 is also provided with an upwardly extending boss 41 which has a vertical passage 48 in engagement with the horizontal passages 44. The vertical passage 48 of the upper boss 41 is provided with a `removable screw plug 49.

By removing the removable plug 49, a charge of suitable volatile fluid may be inserted in the vertical passage 48 and may flow through the horizontal passages 44 into the bellows 4I and down through the guide 40 into the tube 29 of Fig. 1 or into the volatile :duid bulb 36 of Fig. 2. When the charge of Volatile fluid has been inserted in the manner described immediately above, the plug 49 is inserted in the passage 48 to seal the same. Upon an increase in temperature acting on the tube 29 or the volatile fluid bulb 36, the volatile fluid contained therein will volatilize and cause expansion of the bellows 4I and consequent upward movement of the movable enclosure member 42. A decrease in temperature acting on the tube 29 or on the volatile fluid bulb 36 will cause condensation of the volatile fluid contained therein to permit contraction of the bellows 4I and consequent lowering of the lmovp able enclosure member 42. In case the enlarged head of the abutment screw 45 should engage the guide 40, passage of volatile fluid through the guide 40 will be permitted by the radial slots 40 located in the lower extremity of the guide 40. Although we have disclosed a condition responsive means in the form of a temperature responsive means utilizing a volatile fluid for moving the movable enclosure member 42, it is within the contemplation of this invention that the movable enclosure member may be moved by other means and responsive to other conditions. For example, the enclosure member 42 could be moved in response to changes in pressure insteadl of temperature and the pressure changes could.

easily be transmitted into the bellows 4| by a pipe or like means.

The upper boss 41 is exteriorly screw-threaded to receive a screw-threaded sleeve 50. A resilient disc member`5| which is rigidly secured' is adapted to be clamped be to a valve disc 52 tween the screw-threaded sleeve 50 and the movable enclosure member 42 so that upon upward and downward movement ol the movable enclosure member 42. the valve disc 52 will also be moved upwardly and downwardly. The valve disc 52 is adapted at certain times to engage the lower valve seat I6 of the port opening I4 and the resilient disc member 5I, insures a good seating action. It will be noted at this point that the area of the bellows 4| is substantially the same as the area of the valve disc 52 whereby the inlet lpressure acting on the valve disc 52 is -balanced to prevent upward movement of the valve disc 52 by the inlet pressure acting thereon.

A second movable enclosure member located in the outlet chamber I3 is designated at 59 and it has a downwardly extending screw-threaded boss 54 which is adapted to be screwed into the screwthreaded sleeve 56. Since both of the movable enclosure members 42 and 53 are secured together by the sleeve 50, they must move in uniso'n. A valve disc 55 adapted to engage at certain times with the upper valve seat I5 of the port opening I4 is clamped between the movable enclosure member 53 and the screw-threaded sleeve 59. 'I'he movable enclosure member 53 is also provided with an upwardly extending abutment boss 56 which has a slot 51 in the vupper extremity thereof by means of which the movable enclosure member 53 may be screwed into the screwthreaded sleeve 59.

The lower end of a bellows 56 is secured to the movable enclosure member 53 in a fluid-tight manner and the upper end of the bellows 58 is also secured to a guide member 59 in a uid tight manner. The bellows 58 is of substantially the same area as the upper valve disc 55 whereby the loutlet pressure acting on the valve disc 55 is member 59 is held rigidly to the casing lil bymeans of a cap member 6I being screw-threaded on the casing I0 andclamping therebetween the ange lill. The guide member 59 is provided interiorly thereof with a hexagonal opening which is adapted to receive a hexagonal nut 64 as shown clearly in Fig. 4. By reason of this hexagonal relationship, the nut 64 is permitted to move longitudinally in the guide member 59 but rotation thereof is prevented. A spring 65 is guided by and interposed between the hexagonal nut 64 and the movable enclosure member 59 to tend at all times to urge the movable enclosure member 55 in a downward direction. The spring 65 is adapted to resist the upward movement of the movable enclosure members by` volatilization of the volatile iiuid contained in the tube 29 or in the volatile fluid bulb 36. The hexagonal nut 64 is provided interiorly with screw-threads which are adapted to engage and coact with a screw 66 which has an upper extension 61 journalled for longitudinal and rotative movement in the cap member 6I. The screw 56 also has a lower abutment extension 68 adapted at certain times f to engage with the upper abutment boss 56 of the movable enclosure member 53. Secured to the abutment extension 66 by means of a pin 'I6 is a collar 69 which prevents excessive downward movement of the hexagonal nut 64 with respect to the screw 66.

By turning the screw 66, the hexagonal nut 64 is moved upwardly or downwardly to vary the tension in the spring 55 to determine at which condition or at which temperature the force of the volatile iiuid will overcome the spring 65 to move the valves 52 and 55 with respect to their valve seats I6 and I6, respectively. Located between the cap member 6I and the upper surface of the screw 66 is a friction bearing device 1I to permit easy rotation of screw 66 with respect to the cap member 6I.

Mounted above the cap member 6I by means oi tongue arrangements 15 is a bridge 14. Spur gears lsfare mounted between the cap member 6I and the bridge 14 by means of rivets 11. Engaging and coacting with the spur gears 16 is an inner spur gear 16 which contains a key 8l adapted for sliding movement in a key slot 8l) located in an extension 19 of the extension 61.

. cup-shaped I2 and the outlet chamber -By reason of the elongated slot 88 a d the key 8|, relative rotation between the gear 18 and the extension 19 is prevented but longitudinal movement between these two members is permitted.

Rigidly secured to the bridge 14 is an upwardly extending guide member 83 Vupon which is mounted for rotation an actuator sleeve 84. The actuator sleeve 84 is rigidly secured to an annular member 85 which is in turn secured to an internal ring gear 81 by means of rivets 86. The internal ring gear 81 is adapted to engage and coact with the spur gears 16 thus forming a planetary gear system. Upon rotation of the actuator sleeve 84 and consequently the internal ring gear 81 in one direction, the inner spur gear 18 and consequently the screw 66 will be rotated in the opposite direction by reason of the planetary gear construction set out above.

The actuator sleeve 84 is secured against rotation with a strengthening member 89 by means of a key and slot arrangement' 86 or some other like means. The strengthening vmember -89 is moulded 4into a composition handle 98 which handle "is provided' with a pointer 9|. The

strengthening member 89 and the handle 98 are held in engagement with the actuator sleeve 84l by means of a screw 91 having screw-threads 98 engageable with the guide member 83. v

Enclosing the planetary gear system above described is a cover 93 which is secured to the cap member 6I by means of screws 94. Located on the upper surface ofthe cover 93 is a scale plate 95 which is held in place by means ofv rivets 96. The pointer 9i of the handle 98 coacts with the indications on the scale plate 95 to indicate the positions of the parts contained within the casing I8. The scale plate is clearly shown in Fig. 5.

As shown in Fig. 1, the valve 52 is in engagement with its valve seat I6 thereby preventing flow of fluid from the inlet chamber I2 to the outlet chamber I3. Upon a'decrease in temperature acting on the tube 29 or ,the volatile fluid bulb 36, the volatile uid contained therein will condense to decrease the pressure existing in the bellows 4I 'to permit expansion of the spring 65 to move the valve 52 away lfrom its seat I6 to permit communication between the inlet chamber I3. Excessive downward movement which would normally be caused by an excessive decrease in .temperature is pre-- vented by means of the downwardly extending boss 43 engaging the relatively strong spring 46. When the boss 43 so engages the spring 46, the valve discs 52 and 55 are equally spaced from their respective seats I6 and I5 to give maximum opening between the inlet chamber I2 and the outlet chamber I3. Upon an increase in temperature as determined by the tension in the spring 65, the volatile fluid in the tube 29 or in the bulb 36 will volatilize to create a pressure within bellows 4I to cause upward 4movement of valve disc 52 against its seat I6.

The position of the handle 98 as shown in Fig. 5 and designated low temperature corresponds to the position of the parts as shown in Fig. wherein the spring .65 is in its longest aci-'- justment to afford least resistance to upward movement of the valves 52 and 55. In such a position, only a relatively low temperatureacting 'on the tube 29 or the bulb 36 is required to overcome the spring 65 to move the valve 52 to a closed position.

By turning the handle 98 in clockwise direc- Y tion as viewed in Fig. 5 toward the warmer direction, the screw 66 will be turned in the opposhown in Fig. 5, the

` the spring 65. In this manner,

site direction to cause hexagonal nut 64. This downward movement causes an increase in compression inthe spring 65L whereby a greater volatile fluid force acting on the bellows 4| and consequently a higher temperature is required to overcome the' spring 65 to move the valve disc 52 to its seat I6. When downward movement of the the handle 98, as viewed in Fig. 5, is so moved;y

that the pointerI 9| thereof falls along the high temperature line, the hexagonal nut 64 will be moved downwardly into engagement with the collar 69 to prevent further movement of the handle 98. When the hexagonal nut so engages th collar 69, the spring 65 is compressed its grea est amountthereby requiring the highest temperature acting on the tube 29 or the bulb 36 to move idle valve 52 to its seat I6.. From the above, it is seen that when the handle 98 is so positioned that the pointer 9| thereof is located between the low temperature indication and the high temperature indication automatic control of the valve isobtained and the valve willbe opened and closed according to temperature changes acting onv the tube 29 or the bulb 36 whichA temperature changes 'alte determined by theI position of the handle 98.

Y Assume now that the counter-clockwise direction from the position screw 66 will be rotated in.a clockwise direction. Clockwise movement of the screw 66 tends to cause upward movement of the hexagonal nut 64 but since the hexagonal nut 64, is in engagement withthe bearing surface 1I upward movement thereof is prevented. Since the nut 64 cannot move upwardly, the screw 66 must move downwardly and this downward movement of the screw 66 is permitted by the elongated slot 88 which cooperates with the key 8| of the spur gear 18. Downward 'movement of the screw 66 causes the abutment extension 68 to engage the upper abutmentbss 56 of the movable enclosure member 53 to cause downward movement thereoi. Such downward movement moves the valve 55 towards its seat I5 and the valve 52 away from its seat I6. f

When the handle'98 is so positioned that the pointer 9| thereof-coincides with the held open indication of Fig. 5, the valves 55 and '52 will be moved downwardly to such an extent that they will be equally spaced from their respective seats I5 and I6. When the valves 55 and' 52 are moved. to this position, the lower boss 43 of the movable enclosure member 42 engages the spring 46 to resist downward movement beyond this point by the valve as a whole is held in an open .position and variations in temperature eecting the tube 29 or' the bulb 36 wili'liave no effect to move the/valve as a whole 'out of this position.

Further counter-clockwise movement of tie handle 98 will cause further clockwise movement of the screw 66 and further downward movement ofthe valves- 55 and 52. When the handle 98 is rotated in a co lter-clockwise direction suiiiciently far so that the pointer 9| aligns with the held closed indication of Fig. 5, the valves 55 and 52 will be moved downwardly to such an extent that the valve 55 will engage the valve seat I5, suchposition being shown in Fig. 2. This further downward movement of the valves 55 and 52 is permitted by compressing the spring 46. When the valves are moved into this .extreme downward position as shown in Fig. 2, Vthe .passage I4 between the inlet chamber I2 and the outlet chamber I3 is closed .bythe valvef55;

handle so is moved ma vest gaging the valve seat I5 and when the parts are in this position the valve as a whole is held closed and any temperature variations effecting the tube 29 or the bulb 36 will have no effect to move the valve out of this position. f

From the above, it is seen that We have invented a valve that is automatic in operation and that may be manually moved to a. held open position or a held closed position and wherein a singel means is provided whereby the valve may be moved to a held open or a held closed position or whereby the temperature setting of the valve may be adjusted to cause automatic operation of the valve at various conditions or more specilically degrees of temperature.

It is obvious that many modifications may be apparent toI those skilled in the vart and consequently this invention is to be limited only by the scope of the appended claims and the prior art.

We claim as our invention:

l. In a valve of the class described, a pair of valve seats, a pair of valves adapted to move in unison and cooperating with said seats, means responsive to changes in a condition for moving said valves in one direction, resilient means for urging said valves in an opposite direction, manually operated means for adjusting the urging force of said resilient means, manually operated means for positively moving said valves in said opposite direction, and means for limiting movement of said valves insaid opposite direction by said resilient means but allowing such movement by said last-mentioned manually operated means.

2. In a valve of the class described, a pair of valve seats, a pair of valves adapted to move in unison and cooperating with said seats, means responsive tochanges in a condition for moving said valves in one direction, resilient means ior urging said valves in an opposite direction, means for adjusting the urging force of said resilient means, means for positively moving said valves in said opposite direction, manually operated means for operating said last two mentioned means, and means for restricting movement of said valves in said opposite direction. y

3. In a valve of the class described having an inlet chamber, an outlet chamber and a passage therebetween, aligned valve seats associated with said passage, aligned valves adapted to move in unison and: to alternately engage said. seats..

means responsive to changes in. a condition to move one of said valves against one oi'gsaid seats, means resisting the movement of said condition responsive means, manually operated means for moving another of said valves against another of said seats, and means for preventing movement of the other of said valves against the other of said seats by said resisting means.

4. In a valve of the class described having an inlet chamber, an outlet chamber and a passage therebetween, aligned valve seats associated with said passage, aligned valves adapted to move in unison and to alternately )engage said seats, means responsive to changes in a condition to move one of said valves against one of said seats, means resisting the movement of said condition responsive means, means for adjusting the resisting effort of said means, means for moving another of said valves against another oi said seats, a manually operated means for operating said lastvtwo mentioned means, and means for preventing movement of the other of said valves against the other of said seats by said resisting means.

5. In a valve of the class described having an inlet chamber, an outlet chamber and a passage therebetween, a valve seat at each end of the passage and encircling the same, a valve structure adapted to engage alternately one seat or the other, a condition responsive means for moving said valve structure against one of said seats, biasing means for urging said valve structure away from said seat, manually operated means for moving said valve structure against the other oi said seats, and means for preventing said biasing means from moving said valve structure against the other of said seats.

6. In a valve of the class described having an inlet chamber, an outlet chamber and a passage therebetween, a valve seat at each end of the passage and encircling the same, a valve structure adapted to engage alternately one seat or the other, a condition responsive means ior movingisaid valve structure against one of said seats,

biasing means for urging said valve structure away from said seat, manually operated means for adjusting said biasing means and for moving said valve structure against the other of said seats, and means for preventing said biasing means from moving said valve structure against the other of said. seats. Y

'1. In a valve of the class described having an inlet chamber, an outlet chamber and a passage therebetween, a valve seat at each end of said passage and encirclingl the same, a valve structure adapted to engage one seat or the other, a condition responsive device located in said inlet chamber and connected to said valve structure to move said valve structure against one of said seats and to balance the inlet pressure on said valve structure, biasing means engaging said valve structure to urge said valve structure away from said seat, means encompassing said biasing means and located in said outlet chamber to balance said outlet pressure on said valve structure, and means for preventing movement of the valve structure against the other of said seats by said biasing means. J

8. In a valve of the class described, a bellows for urging said valve towards one position, re-

silient means for urging the valve towards another position, and means for preventing movement lof said valve beyond an intermediate position by said resilient means upon rupture of the bellows.

9. In a valve of the class described having an inlet chamber, an outlet chamber and a passage therebetween, aligned valve seats associated with said passage, aligned valves adapted to move in unison and to lalternately engage said seats, a bellows for moving one of said valves against lone of said seats, means for resisting the movement of said bellows and for urging another of said valves against another of said seats, and means for preventing movement of gsaid other valve against said other seat by said urging means upon rupture of said bellows.

10. An automatic valve 'comprising in combination, a valve casing having inlet and outlet passages separated by a partition having a valve port therein, a valve member cooperating with said valve port for controlling the flow of fluid from said inlet passage to said outlet passage, a

condition responsive device for moving said valve member 'in a manner to vary the flow of fluid through said port in accordance with variations in the condition to which said device is responl siveadjusting means for positively moving va-,wnolio valve structure being arranged for alternately engaging said valve seats, a condition responsive device for adjusting said valve structure in a manner to vary ,the iiow of iluid through said port in accordance with variations which said device is responsive, adjusting means for adjusting the condition responsive device and for moving positively said valve structure -to a predetermined position independently of the operation of said condition responsive device, said linearly stationary 'movement means for restricting rotation of said adjusting means comprising a rotatable screw mounted in a manner normally to remain linearly^ stationary while being capablelo linear movement, a nut threaded upon said screw, means' for resisting rotation of said ut to cause linear travel thereof along said screw said nut being arranged to adjust abutment mem-ber arranged tolimit said nut for causing when said\ nut is forced against said abutment, and means actuated bysaid linear travel of'said screw for actuating positively said valve structure. y

- 12. An automaticyalve comprising in combination, a valve casing-having inlet and outlet passages separated by a partition having a valve porttherein, a .pair of valve seats for said valve port, a valve structure cooperating with said valve port for controlling the ow of uid from said inlet passage to said outlet passage, said valve structure being arranged for alternately engaging said valve seats, a condition responsive device for adjusting said valve structure in a mannerrto through said port' in accordance with variations in the condition to which said device is responsive, van adjustment member'for adjusting said condition responsive device, and means actuated by said adjustment .member when moved to predetermined positiins for selectively and positivelyholding\said lvalve structure so as to disengage both seats, or so as to engage one of said seats.

13. In a control device, in combination, a control member, a condition responsive'device for moving said control member, and means for adjusting said condition responsive device and for also positively positioning said control member,

said adjusting and, positive` comprising a pair members, one of and mounted in a positioning means of cooperating screw threaded said members being rotatable manner normally to remain while being capable of-linear other screw threaded member relatively to said first member to cause linear travel of said second mentioned screw threaded member upon rotation of said first member, and an abutment-memin -the condition to. -Said structure and upon rdtation scribed, la -valve casing,

E5l ber arranged to limit linear movement of said seo- I ond member for causing linear travel or said first member upon rotation of said nrst member whenl said second lmember is forced against said abut- 14. An automatic valve comprising in combination, a valve casing having inlet and outlet passages separated by a partition having a valve l port therein, a pair ofrvalve seats for said port disposed on opposite sides thereof, a valve struc- 10 ture comprising a pair of spaced rigidlyoonnected valve elements cooperating withsaid seats tor controllingthe flow' of fluid from said inlet passage to said outlet passage, said valve structure being seats, condition responsive means for' adjusting said valve structure to vary the opening between one of said seats, means for preventing the Iengagement of the valve structure with the other one of said seats under the 2o influence ofthe condition responsive means, and manual means for moving and positively holding the valve structure into engagement ,with said other seat.

15. An automatic yalve comprising in comgl bination, a valve casing having inlet' and outlet passages separated by a partition having a valve 'port therein, a pair of valve seats for said port disposed on opposite sides thereof a valve structure comprising a pair'oi spaced rigidly con-` nected valve elements cooperating with said seats for controlling theI now of fluid from said inlet passage to said outlet passage, said v alve structure being arranged for alternately engaging said seats, condition responsive means for adjusting' said valvestructure to vary the opening between said structure and one of said ats, means for preventing the engagement of the valve structure with the other one of said seats under the influence o! the condition responsive means, and manual means for selectively holding the valve structure with both valve elements vspaced from the valve seats or for positively holding one of the yalve elements in engagementwith said other \seat. l

16. In an automatic valve of the class devalve means within said casing, said -valve means being movable inone direction to gradually decrease the Viiow of iiuid through said casing until the iiow is entirely prevented, said valve means being movable in the other direction to gradually increase the flow oi iluid through the casing, means for moving said valve means in accordance with variations in a variable condition, a resilientstop for limiting i lthe movement ot said valve means in said other direction under the iniiuence o! said condition. responsive means at which time the now through said casing will be at a maximum, resilient means `opposing movement of said valve means in said f first Ydirection by said condition responsive means, and means ,operable by 'manul movement in a single direction for successiv y adjusting said resilient means. holding said valve means to permit iiuidow through said said valve ineens` against the force exerted by said resilient stop to prevent theow of mild through said casing.

'crr'rim A.` RUDOLPH. @WIN o. mcU'rcmlON.

arranged for alternately engaging said 1g casing, and moving CERTIFICATE oF CORRECTIONe Patent No. a,151,o5o March 219 19590 Y cmsTER A; Hummm ET AL, It is hereby vceztzt'ec that error appears im `he printed. epecifceton ofthe above numbered patent requiring correction es followes Page 34 fst column, line 14.6, claim 2, for the word "vestrctmgw :reed resisting; and

that the said Letters Patent should be reed with this correctionwthereln that the same me.;r conform to the record of the ease in the Potent' Office.. i

Signed and sealed this 9th day of Hay, Ao 1Ly 1939:. 

